Transformer-controlled double-path charging circuit and control method thereof

Abstract

The invention relates to the technical field of electric vehicle charging control systems, in particular to a transformer-controlled double-path charging circuit. The circuit comprises an a-end conversion circuit, a b-end conversion circuit, a c-end conversion circuit and a transformer T for connecting the three circuits, the invention further discloses a control method of the transformer-controlled double-path charging circuit. The method comprises the following steps: S1, the controller compares the b-end output voltage and the b-end output current with given output values respectively; andobtaining a result value by inputting a result into a three-pole three-zero-point digital compensator network, wherein the value changes the switching period of an a-end power switch tube and is usedfor controlling the on-off of a first group of power switches Q1 and Q4 and a second group of power switches Q2 and Q3 respectively. The voltage of the two ports can be flexibly controlled by one transformer, the voltage regulation is accurate, and the anti-interference capability is strong; and meanwhile, the circuit has the advantages of small size, low cost and light weight.

Description

technical field [0001] The invention relates to the technical field of electric vehicle charging control systems, in particular to a dual-channel charging circuit controlled by a transformer and a control method thereof. Background technique [0002] In recent years, new energy electric vehicles have been used on a large scale in the market, but they still face the problems of high cost and short cruising range. Cost reduction and efficiency increase are eternal topics. In the on-board charging system, the high-voltage power battery needs to be charged, and the low-voltage 14V electric equipment in the car also needs to be powered. Since the two charging systems are isolated, the prior art The voltage / current of these two ports is controlled by two transformers respectively, which has the problems of high cost and heavy weight. Therefore, there is an urgent need in the industry to develop a charging circuit and a control method that can simultaneously control two isolated o...

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Problems solved by technology

[0002] In recent years, new energy electric vehicles have been used on a large scale in the market, but they still face the problems of high cost and short mileage

Cost reduction and efficiency increase are eternal topics. In the on-board charging system, the high-voltage power battery needs to be charged, and the low-voltage 14V electric equipment in the car also needs to be powered. Since the two charging systems are isolated, the prior art The voltage / current of these two ports is controlled by two transformers respectively, which has the problems of high cost and heavy weight

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